(PHP Extension) RSA Import Public Key from Certificate PEM

Uses a certificate's public key for RSA encryption. The public key from the certificate .pem file is used.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

$cert = new CkCert();

$success = $cert->LoadFromFile('qa_data/pem/mf_public_rsa.pem');
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

// pubKey is a CkPublicKey
$pubKey = $cert->ExportPublicKey();
if ($cert->get_LastMethodSuccess() != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$rsa = new CkRsa();
$success = $rsa->ImportPublicKeyObj($pubKey);
if ($success == false) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

$rsa->put_EncodingMode('base64');
$encryptedStr = $rsa->encryptStringENC('hello',false);
print 'encrypted string = ' . $encryptedStr . "\n";

?>